Herndon Mark (CIK 1754318) reported 4 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-05-21). Recent activity: Buy HKHC (100 shares), Buy HKHC (80 shares), Buy HKHC (100 shares), Buy HKHC (20 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-05-21 | Horizon Kinetics Holding Corp (HKHC) | Chief Financial Officer | Buy | 100 | $2,785 |
| 2026-03-19 | Horizon Kinetics Holding Corp (HKHC) | Chief Financial Officer | Buy | 80 | $2,642 |
| 2025-11-21 | Horizon Kinetics Holding Corp (HKHC) | Chief Financial Officer | Buy | 100 | $2,900 |
| 2025-06-05 | Horizon Kinetics Holding Corp (HKHC) | Chief Financial Officer | Buy | 20 | $804 |
Source: SEC Form 4 filings · as of 2026-05-21